linux-kernel - Re: [PATCH 14/15] x86: convert to use __HEAD and HEAD

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Date:	Mon, 27 Apr 2009 08:42:16 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tim Abbott <tabbott@....EDU>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Anders Kaseorg <andersk@....EDU>,
	Waseem Daher <wdaher@....EDU>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Jeff Arnold <jbarnold@....EDU>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jon Masters <jonathan@...masters.org>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Theodore Ts'o <tytso@....EDU>,
	Nikanth Karthikesan <knikanth@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Kyle McMartin <kyle@...artin.ca>,
	David Howells <dhowells@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 14/15] x86: convert to use __HEAD and HEAD_TEXT macros.

On Mon, Apr 27, 2009 at 06:59:10AM +0200, Ingo Molnar wrote:
> 
> * Sam Ravnborg <sam@...nborg.org> wrote:
> 
> > > As mentioned, though, the much more interesting case would be 
> > > the _real_ kernel vmlinux.lds.S file, which is a lot more 
> > > complex and where the differences between 32-bit and 64-bit 
> > > cases aren't totally trivial.
> > 
> > Agreed.
> > 
> > But I expect someone else to do so.
> > When I am in unification mode I try to spend time on
> > architectures with less people involved.
> 
> thanks for reconsidering - and i've applied your patch - thanks Sam.
> 
> Architectures with lots of people involved (hm, what a strange way 
> to say 'x86' ;-) tend to be logistically more complex and there's an 
> (understandably) stronger pushback against regressions - but that is 
> also where unification is actually needed the most and where the 
> ongoing costs of splintered code is the highest.
Well - the effort done for sparc and m68k lately was also needed.

> Your kbuild patches 
> are making quite a bit of difference so please dont hold back :)
The good patches are the ones that benefits all architectures.

Well - I can give the vmlinux_*.ds files a try.
Did you apply the patch to an append only branch or may I recreate
the patch?
I noticed a few minor things that can be 'fixed' to bring the inital
differences between 32 bit and 64 bit down.

But I can do these in a follow-up patch too.

	Sam
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